[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([O:19][CH3:20])=[C:13]([CH:18]=1)[C:14]([O:16]C)=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl>C1COCC1.CO.[OH-].[Na+]>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([O:19][CH3:20])=[C:13]([CH:18]=1)[C:14]([OH:16])=[O:15])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Methyl 5-benzyloxy-2-methoxybenzoate (3.72 g) was dissolved in a mixed solvent of THF (30 ml) and methanol (30 ml), and 1N aqueous sodium hydroxide solution (27.3 ml) was added to the mixed solution. The mixture was stirred at room temperature for 2 days, and 1N aqueous hydrochloric acid solution (40 ml) was added. The precipitate was collected by filtration and washed with water to give 5-benzyloxy-2-methoxybenzoic acid (3.10 g, 88%) as colorless crystals.
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